synchronization

Syntax

synchronization {primary (external-a | external-b);secondary (external-a | external-b);signal-type (t1 | e1);switching-mode (revertive | non-revertive);transmitter-enable;validation-interval seconds;y-cable-line-termination;}

Hierarchy Level

[edit chassis]

Release Information

Statement introduced in JUNOS Release 7.6.

Statement introduced on the M120 router in JUNOS Release 9.3.

Description

(M320, M40e, and M120 routers only) Configure an external synchronization interface to synchronize the internal Stratum 3 clock to an external source, and then synchronize the chassis interface clock to that source.

Options

primary—First external timing source specified in the configuration hierarchy. This statement has the following suboptions:

external-a—Use external-a as the primary clock synchronization source.
external-b—Use external-b as the primary clock synchronization source.

secondary—Second external timing source specified in the configuration hierarchy.

external-a—Use external-a as the secondary clock synchronization source.
external-b—Use external-b as the secondary clock synchronization source.

signal-type—Specify the line encoding mode for interfaces: either t1 or e1. For the M40e router, only the t1 signal-type mode is supported.

Default: t1

switching-mode—Specify revertive if a lower-priority synchronization can be switched to a valid, higher-priority synchronization.

Default: non-revertive

transmitter-enable— (M320 routers only) Control whether the diagnostic timing signal is transmitted.

validation-interval—Validate the synchronized deviation. If revertive switching is enabled and a higher-priority clock is validated, the clock module is directed to the higher-priority clock, and all configured and active synchronizations are validated. The validation timer resumes after the current validation interval expires.

Range: (M320 and M40e routers) 90 through 86400 seconds. (M120 routers) 30 through 86400 seconds.

Default: (M320 and M40e routers): 90 seconds. (M120 routers):30 seconds

y-cable-line-termination—(M320 routers only) Specify that a single signal be wired to both Control Boards (CBs) using a Y-cable.

Required Privilege Level

interface—To view this statement in the configuration.

interface-control—To add this statement to the configuration.